From: Yu Zhao <yuzhao@google.com> To: Andrew Morton <akpm@linux-foundation.org> Cc: "Andi Kleen" <ak@linux.intel.com>, "Aneesh Kumar" <aneesh.kumar@linux.ibm.com>, "Catalin Marinas" <catalin.marinas@arm.com>, "Dave Hansen" <dave.hansen@linux.intel.com>, "Hillf Danton" <hdanton@sina.com>, "Jens Axboe" <axboe@kernel.dk>, "Johannes Weiner" <hannes@cmpxchg.org>, "Jonathan Corbet" <corbet@lwn.net>, "Linus Torvalds" <torvalds@linux-foundation.org>, "Matthew Wilcox" <willy@infradead.org>, "Mel Gorman" <mgorman@suse.de>, "Michael Larabel" <Michael@michaellarabel.com>, "Michal Hocko" <mhocko@kernel.org>, "Mike Rapoport" <rppt@kernel.org>, "Peter Zijlstra" <peterz@infradead.org>, "Tejun Heo" <tj@kernel.org>, "Vlastimil Babka" <vbabka@suse.cz>, "Will Deacon" <will@kernel.org>, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, page-reclaim@google.com, "Yu Zhao" <yuzhao@google.com>, "Brian Geffon" <bgeffon@google.com>, "Jan Alexander Steffens" <heftig@archlinux.org>, "Oleksandr Natalenko" <oleksandr@natalenko.name>, "Steven Barrett" <steven@liquorix.net>, "Suleiman Souhlal" <suleiman@google.com>, "Daniel Byrne" <djbyrne@mtu.edu>, "Donald Carr" <d@chaos-reins.com>, "Holger Hoffstätte" <holger@applied-asynchrony.com>, "Konstantin Kharlamov" <Hi-Angel@yandex.ru>, "Shuang Zhai" <szhai2@cs.rochester.edu>, "Sofia Trinh" <sofia.trinh@edi.works>, "Vaibhav Jain" <vaibhav@linux.ibm.com> Subject: [PATCH v13 11/14] mm: multi-gen LRU: thrashing prevention Date: Wed, 6 Jul 2022 16:00:20 -0600 [thread overview] Message-ID: <20220706220022.968789-12-yuzhao@google.com> (raw) In-Reply-To: <20220706220022.968789-1-yuzhao@google.com> Add /sys/kernel/mm/lru_gen/min_ttl_ms for thrashing prevention, as requested by many desktop users [1]. When set to value N, it prevents the working set of N milliseconds from getting evicted. The OOM killer is triggered if this working set cannot be kept in memory. Based on the average human detectable lag (~100ms), N=1000 usually eliminates intolerable lags due to thrashing. Larger values like N=3000 make lags less noticeable at the risk of premature OOM kills. Compared with the size-based approach [2], this time-based approach has the following advantages: 1. It is easier to configure because it is agnostic to applications and memory sizes. 2. It is more reliable because it is directly wired to the OOM killer. [1] https://lore.kernel.org/r/Ydza%2FzXKY9ATRoh6@google.com/ [2] https://lore.kernel.org/r/20101028191523.GA14972@google.com/ Signed-off-by: Yu Zhao <yuzhao@google.com> Acked-by: Brian Geffon <bgeffon@google.com> Acked-by: Jan Alexander Steffens (heftig) <heftig@archlinux.org> Acked-by: Oleksandr Natalenko <oleksandr@natalenko.name> Acked-by: Steven Barrett <steven@liquorix.net> Acked-by: Suleiman Souhlal <suleiman@google.com> Tested-by: Daniel Byrne <djbyrne@mtu.edu> Tested-by: Donald Carr <d@chaos-reins.com> Tested-by: Holger Hoffstätte <holger@applied-asynchrony.com> Tested-by: Konstantin Kharlamov <Hi-Angel@yandex.ru> Tested-by: Shuang Zhai <szhai2@cs.rochester.edu> Tested-by: Sofia Trinh <sofia.trinh@edi.works> Tested-by: Vaibhav Jain <vaibhav@linux.ibm.com> --- include/linux/mmzone.h | 2 ++ mm/vmscan.c | 71 +++++++++++++++++++++++++++++++++++++++--- 2 files changed, 69 insertions(+), 4 deletions(-) diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 840b7ca8b91f..472bd5335517 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -419,6 +419,8 @@ struct lru_gen_struct { unsigned long max_seq; /* the eviction increments the oldest generation numbers */ unsigned long min_seq[ANON_AND_FILE]; + /* the birth time of each generation in jiffies */ + unsigned long timestamps[MAX_NR_GENS]; /* the multi-gen LRU lists, lazily sorted on eviction */ struct list_head lists[MAX_NR_GENS][ANON_AND_FILE][MAX_NR_ZONES]; /* the multi-gen LRU sizes, eventually consistent */ diff --git a/mm/vmscan.c b/mm/vmscan.c index 4c8b475429ed..1f2892a0dc41 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -4233,6 +4233,7 @@ static void inc_max_seq(struct lruvec *lruvec, bool can_swap) for (type = 0; type < ANON_AND_FILE; type++) reset_ctrl_pos(lruvec, type, false); + WRITE_ONCE(lrugen->timestamps[next], jiffies); /* make sure preceding modifications appear */ smp_store_release(&lrugen->max_seq, lrugen->max_seq + 1); @@ -4359,7 +4360,7 @@ static unsigned long get_nr_evictable(struct lruvec *lruvec, unsigned long max_s return total; } -static void age_lruvec(struct lruvec *lruvec, struct scan_control *sc) +static bool age_lruvec(struct lruvec *lruvec, struct scan_control *sc, unsigned long min_ttl) { bool need_aging; unsigned long nr_to_scan; @@ -4373,21 +4374,40 @@ static void age_lruvec(struct lruvec *lruvec, struct scan_control *sc) mem_cgroup_calculate_protection(NULL, memcg); if (mem_cgroup_below_min(memcg)) - return; + return false; nr_to_scan = get_nr_evictable(lruvec, max_seq, min_seq, swappiness, &need_aging); if (!nr_to_scan) - return; + return false; nr_to_scan >>= mem_cgroup_online(memcg) ? sc->priority : 0; + if (min_ttl) { + int gen = lru_gen_from_seq(min_seq[LRU_GEN_FILE]); + unsigned long birth = READ_ONCE(lruvec->lrugen.timestamps[gen]); + + if (time_is_after_jiffies(birth + min_ttl)) + return false; + + /* the size is likely too small to be helpful */ + if (!nr_to_scan && sc->priority != DEF_PRIORITY) + return false; + } + if (nr_to_scan && need_aging) try_to_inc_max_seq(lruvec, max_seq, sc, swappiness); + + return true; } +/* to protect the working set of the last N jiffies */ +static unsigned long lru_gen_min_ttl __read_mostly; + static void lru_gen_age_node(struct pglist_data *pgdat, struct scan_control *sc) { struct mem_cgroup *memcg; + bool success = false; + unsigned long min_ttl = READ_ONCE(lru_gen_min_ttl); VM_WARN_ON_ONCE(!current_is_kswapd()); @@ -4413,12 +4433,28 @@ static void lru_gen_age_node(struct pglist_data *pgdat, struct scan_control *sc) do { struct lruvec *lruvec = mem_cgroup_lruvec(memcg, pgdat); - age_lruvec(lruvec, sc); + if (age_lruvec(lruvec, sc, min_ttl)) + success = true; cond_resched(); } while ((memcg = mem_cgroup_iter(NULL, memcg, NULL))); clear_mm_walk(); + + /* + * The main goal is to OOM kill if every generation from all memcgs is + * younger than min_ttl. However, another theoretical possibility is all + * memcgs are either below min or empty. + */ + if (!success && !sc->order && mutex_trylock(&oom_lock)) { + struct oom_control oc = { + .gfp_mask = sc->gfp_mask, + }; + + out_of_memory(&oc); + + mutex_unlock(&oom_lock); + } } /* @@ -5135,6 +5171,28 @@ static void lru_gen_change_state(bool enabled) * sysfs interface ******************************************************************************/ +static ssize_t show_min_ttl(struct kobject *kobj, struct kobj_attribute *attr, char *buf) +{ + return sprintf(buf, "%u\n", jiffies_to_msecs(READ_ONCE(lru_gen_min_ttl))); +} + +static ssize_t store_min_ttl(struct kobject *kobj, struct kobj_attribute *attr, + const char *buf, size_t len) +{ + unsigned int msecs; + + if (kstrtouint(buf, 0, &msecs)) + return -EINVAL; + + WRITE_ONCE(lru_gen_min_ttl, msecs_to_jiffies(msecs)); + + return len; +} + +static struct kobj_attribute lru_gen_min_ttl_attr = __ATTR( + min_ttl_ms, 0644, show_min_ttl, store_min_ttl +); + static ssize_t show_enabled(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { unsigned int caps = 0; @@ -5183,6 +5241,7 @@ static struct kobj_attribute lru_gen_enabled_attr = __ATTR( ); static struct attribute *lru_gen_attrs[] = { + &lru_gen_min_ttl_attr.attr, &lru_gen_enabled_attr.attr, NULL }; @@ -5198,12 +5257,16 @@ static struct attribute_group lru_gen_attr_group = { void lru_gen_init_lruvec(struct lruvec *lruvec) { + int i; int gen, type, zone; struct lru_gen_struct *lrugen = &lruvec->lrugen; lrugen->max_seq = MIN_NR_GENS + 1; lrugen->enabled = lru_gen_enabled(); + for (i = 0; i <= MIN_NR_GENS + 1; i++) + lrugen->timestamps[i] = jiffies; + for_each_gen_type_zone(gen, type, zone) INIT_LIST_HEAD(&lrugen->lists[gen][type][zone]); -- 2.37.0.rc0.161.g10f37bed90-goog
WARNING: multiple messages have this Message-ID (diff)
From: Yu Zhao <yuzhao@google.com> To: Andrew Morton <akpm@linux-foundation.org> Cc: "Andi Kleen" <ak@linux.intel.com>, "Aneesh Kumar" <aneesh.kumar@linux.ibm.com>, "Catalin Marinas" <catalin.marinas@arm.com>, "Dave Hansen" <dave.hansen@linux.intel.com>, "Hillf Danton" <hdanton@sina.com>, "Jens Axboe" <axboe@kernel.dk>, "Johannes Weiner" <hannes@cmpxchg.org>, "Jonathan Corbet" <corbet@lwn.net>, "Linus Torvalds" <torvalds@linux-foundation.org>, "Matthew Wilcox" <willy@infradead.org>, "Mel Gorman" <mgorman@suse.de>, "Michael Larabel" <Michael@michaellarabel.com>, "Michal Hocko" <mhocko@kernel.org>, "Mike Rapoport" <rppt@kernel.org>, "Peter Zijlstra" <peterz@infradead.org>, "Tejun Heo" <tj@kernel.org>, "Vlastimil Babka" <vbabka@suse.cz>, "Will Deacon" <will@kernel.org>, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, page-reclaim@google.com, "Yu Zhao" <yuzhao@google.com>, "Brian Geffon" <bgeffon@google.com>, "Jan Alexander Steffens" <heftig@archlinux.org>, "Oleksandr Natalenko" <oleksandr@natalenko.name>, "Steven Barrett" <steven@liquorix.net>, "Suleiman Souhlal" <suleiman@google.com>, "Daniel Byrne" <djbyrne@mtu.edu>, "Donald Carr" <d@chaos-reins.com>, "Holger Hoffstätte" <holger@applied-asynchrony.com>, "Konstantin Kharlamov" <Hi-Angel@yandex.ru>, "Shuang Zhai" <szhai2@cs.rochester.edu>, "Sofia Trinh" <sofia.trinh@edi.works>, "Vaibhav Jain" <vaibhav@linux.ibm.com> Subject: [PATCH v13 11/14] mm: multi-gen LRU: thrashing prevention Date: Wed, 6 Jul 2022 16:00:20 -0600 [thread overview] Message-ID: <20220706220022.968789-12-yuzhao@google.com> (raw) In-Reply-To: <20220706220022.968789-1-yuzhao@google.com> Add /sys/kernel/mm/lru_gen/min_ttl_ms for thrashing prevention, as requested by many desktop users [1]. When set to value N, it prevents the working set of N milliseconds from getting evicted. The OOM killer is triggered if this working set cannot be kept in memory. Based on the average human detectable lag (~100ms), N=1000 usually eliminates intolerable lags due to thrashing. Larger values like N=3000 make lags less noticeable at the risk of premature OOM kills. Compared with the size-based approach [2], this time-based approach has the following advantages: 1. It is easier to configure because it is agnostic to applications and memory sizes. 2. It is more reliable because it is directly wired to the OOM killer. [1] https://lore.kernel.org/r/Ydza%2FzXKY9ATRoh6@google.com/ [2] https://lore.kernel.org/r/20101028191523.GA14972@google.com/ Signed-off-by: Yu Zhao <yuzhao@google.com> Acked-by: Brian Geffon <bgeffon@google.com> Acked-by: Jan Alexander Steffens (heftig) <heftig@archlinux.org> Acked-by: Oleksandr Natalenko <oleksandr@natalenko.name> Acked-by: Steven Barrett <steven@liquorix.net> Acked-by: Suleiman Souhlal <suleiman@google.com> Tested-by: Daniel Byrne <djbyrne@mtu.edu> Tested-by: Donald Carr <d@chaos-reins.com> Tested-by: Holger Hoffstätte <holger@applied-asynchrony.com> Tested-by: Konstantin Kharlamov <Hi-Angel@yandex.ru> Tested-by: Shuang Zhai <szhai2@cs.rochester.edu> Tested-by: Sofia Trinh <sofia.trinh@edi.works> Tested-by: Vaibhav Jain <vaibhav@linux.ibm.com> --- include/linux/mmzone.h | 2 ++ mm/vmscan.c | 71 +++++++++++++++++++++++++++++++++++++++--- 2 files changed, 69 insertions(+), 4 deletions(-) diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 840b7ca8b91f..472bd5335517 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -419,6 +419,8 @@ struct lru_gen_struct { unsigned long max_seq; /* the eviction increments the oldest generation numbers */ unsigned long min_seq[ANON_AND_FILE]; + /* the birth time of each generation in jiffies */ + unsigned long timestamps[MAX_NR_GENS]; /* the multi-gen LRU lists, lazily sorted on eviction */ struct list_head lists[MAX_NR_GENS][ANON_AND_FILE][MAX_NR_ZONES]; /* the multi-gen LRU sizes, eventually consistent */ diff --git a/mm/vmscan.c b/mm/vmscan.c index 4c8b475429ed..1f2892a0dc41 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -4233,6 +4233,7 @@ static void inc_max_seq(struct lruvec *lruvec, bool can_swap) for (type = 0; type < ANON_AND_FILE; type++) reset_ctrl_pos(lruvec, type, false); + WRITE_ONCE(lrugen->timestamps[next], jiffies); /* make sure preceding modifications appear */ smp_store_release(&lrugen->max_seq, lrugen->max_seq + 1); @@ -4359,7 +4360,7 @@ static unsigned long get_nr_evictable(struct lruvec *lruvec, unsigned long max_s return total; } -static void age_lruvec(struct lruvec *lruvec, struct scan_control *sc) +static bool age_lruvec(struct lruvec *lruvec, struct scan_control *sc, unsigned long min_ttl) { bool need_aging; unsigned long nr_to_scan; @@ -4373,21 +4374,40 @@ static void age_lruvec(struct lruvec *lruvec, struct scan_control *sc) mem_cgroup_calculate_protection(NULL, memcg); if (mem_cgroup_below_min(memcg)) - return; + return false; nr_to_scan = get_nr_evictable(lruvec, max_seq, min_seq, swappiness, &need_aging); if (!nr_to_scan) - return; + return false; nr_to_scan >>= mem_cgroup_online(memcg) ? sc->priority : 0; + if (min_ttl) { + int gen = lru_gen_from_seq(min_seq[LRU_GEN_FILE]); + unsigned long birth = READ_ONCE(lruvec->lrugen.timestamps[gen]); + + if (time_is_after_jiffies(birth + min_ttl)) + return false; + + /* the size is likely too small to be helpful */ + if (!nr_to_scan && sc->priority != DEF_PRIORITY) + return false; + } + if (nr_to_scan && need_aging) try_to_inc_max_seq(lruvec, max_seq, sc, swappiness); + + return true; } +/* to protect the working set of the last N jiffies */ +static unsigned long lru_gen_min_ttl __read_mostly; + static void lru_gen_age_node(struct pglist_data *pgdat, struct scan_control *sc) { struct mem_cgroup *memcg; + bool success = false; + unsigned long min_ttl = READ_ONCE(lru_gen_min_ttl); VM_WARN_ON_ONCE(!current_is_kswapd()); @@ -4413,12 +4433,28 @@ static void lru_gen_age_node(struct pglist_data *pgdat, struct scan_control *sc) do { struct lruvec *lruvec = mem_cgroup_lruvec(memcg, pgdat); - age_lruvec(lruvec, sc); + if (age_lruvec(lruvec, sc, min_ttl)) + success = true; cond_resched(); } while ((memcg = mem_cgroup_iter(NULL, memcg, NULL))); clear_mm_walk(); + + /* + * The main goal is to OOM kill if every generation from all memcgs is + * younger than min_ttl. However, another theoretical possibility is all + * memcgs are either below min or empty. + */ + if (!success && !sc->order && mutex_trylock(&oom_lock)) { + struct oom_control oc = { + .gfp_mask = sc->gfp_mask, + }; + + out_of_memory(&oc); + + mutex_unlock(&oom_lock); + } } /* @@ -5135,6 +5171,28 @@ static void lru_gen_change_state(bool enabled) * sysfs interface ******************************************************************************/ +static ssize_t show_min_ttl(struct kobject *kobj, struct kobj_attribute *attr, char *buf) +{ + return sprintf(buf, "%u\n", jiffies_to_msecs(READ_ONCE(lru_gen_min_ttl))); +} + +static ssize_t store_min_ttl(struct kobject *kobj, struct kobj_attribute *attr, + const char *buf, size_t len) +{ + unsigned int msecs; + + if (kstrtouint(buf, 0, &msecs)) + return -EINVAL; + + WRITE_ONCE(lru_gen_min_ttl, msecs_to_jiffies(msecs)); + + return len; +} + +static struct kobj_attribute lru_gen_min_ttl_attr = __ATTR( + min_ttl_ms, 0644, show_min_ttl, store_min_ttl +); + static ssize_t show_enabled(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { unsigned int caps = 0; @@ -5183,6 +5241,7 @@ static struct kobj_attribute lru_gen_enabled_attr = __ATTR( ); static struct attribute *lru_gen_attrs[] = { + &lru_gen_min_ttl_attr.attr, &lru_gen_enabled_attr.attr, NULL }; @@ -5198,12 +5257,16 @@ static struct attribute_group lru_gen_attr_group = { void lru_gen_init_lruvec(struct lruvec *lruvec) { + int i; int gen, type, zone; struct lru_gen_struct *lrugen = &lruvec->lrugen; lrugen->max_seq = MIN_NR_GENS + 1; lrugen->enabled = lru_gen_enabled(); + for (i = 0; i <= MIN_NR_GENS + 1; i++) + lrugen->timestamps[i] = jiffies; + for_each_gen_type_zone(gen, type, zone) INIT_LIST_HEAD(&lrugen->lists[gen][type][zone]); -- 2.37.0.rc0.161.g10f37bed90-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2022-07-06 22:01 UTC|newest] Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-07-06 22:00 [PATCH v13 00/14] Multi-Gen LRU Framework Yu Zhao 2022-07-06 22:00 ` Yu Zhao 2022-07-06 22:00 ` [PATCH v13 01/14] mm: x86, arm64: add arch_has_hw_pte_young() Yu Zhao 2022-07-06 22:00 ` Yu Zhao 2022-07-06 22:00 ` [PATCH v13 02/14] mm: x86: add CONFIG_ARCH_HAS_NONLEAF_PMD_YOUNG Yu Zhao 2022-07-06 22:00 ` Yu Zhao 2022-07-06 22:00 ` [PATCH v13 03/14] mm/vmscan.c: refactor shrink_node() Yu Zhao 2022-07-06 22:00 ` Yu Zhao 2022-07-06 22:00 ` [PATCH v13 04/14] Revert "include/linux/mm_inline.h: fold __update_lru_size() into its sole caller" Yu Zhao 2022-07-06 22:00 ` Yu Zhao 2022-07-06 22:00 ` [PATCH v13 05/14] mm: multi-gen LRU: groundwork Yu Zhao 2022-07-06 22:00 ` Yu Zhao 2022-07-06 22:00 ` [PATCH v13 06/14] mm: multi-gen LRU: minimal implementation Yu Zhao 2022-07-06 22:00 ` Yu Zhao 2022-07-06 22:00 ` [PATCH v13 07/14] mm: multi-gen LRU: exploit locality in rmap Yu Zhao 2022-07-06 22:00 ` Yu Zhao 2022-07-06 22:00 ` [PATCH v13 08/14] mm: multi-gen LRU: support page table walks Yu Zhao 2022-07-06 22:00 ` Yu Zhao 2022-07-06 22:26 ` Yu Zhao 2022-07-06 22:26 ` Yu Zhao 2022-07-07 1:23 ` Liam Howlett 2022-07-07 1:23 ` Liam Howlett 2022-07-06 22:00 ` [PATCH v13 09/14] mm: multi-gen LRU: optimize multiple memcgs Yu Zhao 2022-07-06 22:00 ` Yu Zhao 2022-07-06 22:00 ` [PATCH v13 10/14] mm: multi-gen LRU: kill switch Yu Zhao 2022-07-06 22:00 ` Yu Zhao 2022-07-06 22:00 ` Yu Zhao [this message] 2022-07-06 22:00 ` [PATCH v13 11/14] mm: multi-gen LRU: thrashing prevention Yu Zhao 2022-07-06 22:00 ` [PATCH v13 12/14] mm: multi-gen LRU: debugfs interface Yu Zhao 2022-07-06 22:00 ` Yu Zhao 2022-07-06 22:00 ` [PATCH v13 13/14] mm: multi-gen LRU: admin guide Yu Zhao 2022-07-06 22:00 ` Yu Zhao 2022-07-10 2:20 ` Bagas Sanjaya 2022-07-10 2:20 ` Bagas Sanjaya 2022-07-06 22:00 ` [PATCH v13 14/14] mm: multi-gen LRU: design doc Yu Zhao 2022-07-06 22:00 ` Yu Zhao 2022-07-10 2:21 ` Bagas Sanjaya 2022-07-10 2:21 ` Bagas Sanjaya 2022-07-07 3:03 ` [PATCH v13 00/14] Multi-Gen LRU Framework Bagas Sanjaya 2022-07-07 3:03 ` Bagas Sanjaya 2022-07-09 19:31 ` Yu Zhao 2022-07-09 19:31 ` Yu Zhao 2022-07-10 1:09 ` Bagas Sanjaya 2022-07-10 1:09 ` Bagas Sanjaya
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